Tuning dial for radio sets



1937- u. QUINTAVALLE H 2,100,453

. TUNING DIAL FOR RADI SETS Filed Dec. 8, 1936 2 Sheets-Sheet 1 TUNINGDIAL FOR RADIO sm-s Filed Dec. 8, 1956 2 Sheets-Sheet 2 It I\ Jump/3v.-A immmz 6 z Patented Nov. 30,1937

" UNITED,

'I GIaims. (1211164241) v Tuning indicators for radio receiversarekno'wn which include a dial having a geographical map thereon onwhich the respective locations of sending stations are and a pointerarranged to move across said dial; these indicators are subject to theobjectionthat the several stations are .not by order of frequency oftheir own optrative wave in respect of the movement of the pointeracross said dial and accordingly the operator at the moment he wants tovtlmefrom a given station into another station has no suggestion as tothe position of the wanted station along the frequency scale nor as todirection in whichthe tuning control is to bemanipulated inorder 'totune into the wanted station;

The'present inventi' n has for its object a tun-- ing indicating devicewhich removes thejabove' stated objections and provides for easilytuning" into the several stations in terms of tli'eirrespecg tivegeographicallocation.

l a embodiment of. this invention is illustrated by way of example intheannexed drawings in which:

' Fig. 1 is a front view showing the dial mounted on a support therefonFig. 2 is a section showing the provision ofa light pointer arranged tomove behind said dial and made on line 2-2 of Fig. 3; and

Fig. 3 is a transverse vertical section on line 80 3-3 of Fig. 2.

' In the illustrated embodiment I is a dial on which a map of a desiredregion is shown; on

said map a spot is provided in register withthe 1 geographical locationof each sending stationto 85 be tuned into, said spot consisting in theillustrated embodiment of a small circle 2 in register with saidgeographical location of the station on the map. p

A pointer shown in the drawings as a line 3, is

40 mounted to move across said dial l and is connected in-any preferredand conventional man-E ner with the tuning means shown by the knob 41said tuning means may be of any preferred or conventional constructionand includes means 45 operated by the knob 4 and operating the tuningelement of the radio set as well as the pointer 3 in unison; the pointer3-accordingly moves in proportion with progressive variation offrequency, the values of frequency being shown on 60 a scale 8 extendingacross the geographical mapor representation.

Each of said spots 3 has a position on said dial I which depends uponthe geographical location of a sending station, and it is associated bya 66 leading line 1 with a mark 5 provided across animal in a locationwhich aepndsiubloii the value of frequency on which said sending stationoperates. a

Two or more frequency marks are provided, in

respect of spots individuating thelocations where 5 two ormoresendingstations operative on dif- .f'erent frequencies are located,and such marks shown int, 5'! in respectof a spot 29 arelcou .pledthereto by means of one or more leading lines'as|.'l'.- v v p whenit'is' desired to tune Ith'e'radio receiver set on a sending stationhavingv a geojgraphical location individuated by a spot'as 2' or 2", theknob 4 is manipulatedto carry the pointer '3'in register with a mark asi, or 3" or I" con-. 15

nected with said spot 2 or a? by a leading line 1 when onthe contrary itis desired toindividw fate an unknown stationcoming'into at "aj time thepointer 3 has a'given'positionacross the dial, 20 the operatorascertains. along the said pointer 3 the particular mark 5 or' I or 15"said pointer intersects; then t l ne 1, 1* connected with said markleads to thespot 2 or 2 defining on the dial l the geographical locationof said station. g5

-To differentiate said spots and marks as I, 5, etc. they may havesharply different shapes as illustrated, and they or a number of themmay be proper to be made visible by means of a light. source located atthe rear of the dial "and'by making said spots and marks 'or dialtranslucent- I as conventional; the marks pertaining to stations havingthe same location and operating onidif f ferent frequencies may havediiferent configurations or colours. p v The pointer 3 may also beprovided with a light source for the purpose of illuminating aperturesmade in the" diali to provide the marks as s,

may be of any desired construction. Figures 2 and 3 illustrate theprovision of a lightpointer 1 a arranged to move behind the dial I. Asillus trated in said figures, twohorizontal guide bars v 8, 8' arefastened in the support 9 behind the dial l at the top and bottom.thereof respec- 'tively, and an eiongatedcasing II hasrollers I i,- IIl' pivotally mounted adjacent its ends to run on said guide bars 3,3';'said casing i0 is coextensive with the height of the dial ly andalongi-f I tudinai slot l1 extends throughout its front wall facing thedial l.-

Lamps i2 arelocated in the casing "and are It is to be understood thatmeans for actuat 40 f ing the pointer 3 in accordance with tune controlfed from a source of electric current by means of leads I3.

A cord H has its ends connected with one end of casing III; said cord l4runs on pulleys i5 loosely pivoted on the support 9 and over a drivinsplllley I6 fast with the tune control knob 4.

When the feeding circuit of lamps I2 is closed, said lamps cause alinear light beam to emanate through slot I l of the casing l0 and saidlinear beam may be caused to traverse the dial l by the V manipulationof the knob 4.

What I claim as my invention and desire to secure by United StatesLetters Patent'isz- 1. Ina radio receiving set, a dial having a geographical map thereon, a spot on said map 'in register with thegeographical location of a sending station, a mark having a positioncorresponding with the operating frequency of said station by terms ofprogression of frequency, a leading line connecting said spot and markand a pointer movable in progression of-frequency across said dial.

2. In a radio receiving set, a dial having a geographical map thereon,spots on said map each in register with a geographical location, markseach having a position corresponding with the operating frequency of asending station in said location said marks being located inprogressionbf fre-v quency across said dial, leading lines connectingsaid spots and marks pertaining to each given location and a pointermovable in progression of frequency across said dial, a v

3. In a radio receiving set, adialhaving' a geographical map thereon, aspot on said'mapin register with a geographical location, marks on saiddial each having aposition corresponding with the operating frequency ofradio sending stations in said location by terms of progression offrequency, leading lines from said marks to said spot, and a pointermovable in progression of frequency across said dial. 7 j f,

4. In a radio receiving set, a dial having a geographical map thereon, a"spot on said map in said spot and arpointer movable in progression offrequency across said dial; I g

5. In a radio receiving set, a dial having a geographical map thereon, aspot on said map in register with a geographical location, marks on saiddial each having a position corresponding with the operating frequencyof radio sending stations in saidlocation by terms of progression offrequency, said marks being differentiated by their configurations.leading lines from said marksto said spot, and a pointer movable inprogression of frequency across said dial.

6. In a radio receiving set, a dial having a geographical map thereon,spots on said map each 'in'regis'ter with a geographical location, markshaving a position corresponding with the operating frequency of asending station in said locatio n said marks being located inprogression of frequency across said dial said spots,and said marksbeing differentiated by their respective colours, leading linesconnecting said spots and 'marks pertaining to each given location and apointer movable in progression of frequency across said dial. 1 v, 7. Ina radio're'ceiving set, a dial having a geo-,

graphical map thereon, spots on said'map each in register with ageographical location, marks "ea'ch havinga position corresponding withthe operating frequency of a sending station in said location said marksbeing located in progression of frequency across ,said dial said spotsand said marks being differentiated by their respective conflgurations,leading lines connecting said spots and marks pertaining to each givenlocation and a pointer movable in progression of frequency across saiddial.

, QUIN'IAVALLI.

